PAT 甲级 1028 List Sorting (25 分) STL +sort

灰太狼 2024-02-19 21:29 50阅读 0赞

## 1028 List Sorting (25 分) ##

Excel can sort records according to any column. Now you are supposed to imitate this function.

#### Input Specification: ####

Each input file contains one test case. For each case, the first line contains two integers N (≤105) and C, where N is the number of records and C is the column that you are supposed to sort the records with. Then N lines follow, each contains a record of a student. A student's record consists of his or her distinct ID (a 6-digit number), name (a string with no more than 8 characters without space), and grade (an integer between 0 and 100, inclusive).

#### Output Specification: ####

For each test case, output the sorting result in N lines. That is, if C = 1 then the records must be sorted in increasing order according to ID's; if C = 2 then the records must be sorted in non-decreasing order according to names; and if C = 3 then the records must be sorted in non-decreasing order according to grades. If there are several students who have the same name or grade, they must be sorted according to their ID's in increasing order.

#### Sample Input 1: ####

3 1
    000007 James 85
    000010 Amy 90
    000001 Zoe 60

#### Sample Output 1: ####

000001 Zoe 60
    000007 James 85
    000010 Amy 90

#### Sample Input 2: ####

4 2
    000007 James 85
    000010 Amy 90
    000001 Zoe 60
    000002 James 98

#### Sample Output 2: ####

000010 Amy 90
    000002 James 98
    000007 James 85
    000001 Zoe 60

#### Sample Input 3: ####

4 3
    000007 James 85
    000010 Amy 90
    000001 Zoe 60
    000002 James 90

#### Sample Output 3: ####

000001 Zoe 60
    000007 James 85
    000002 James 90
    000010 Amy 90

注意排序规则

#include<iostream>
    #include<cstring>
    #include<cstdio>
    #include<vector>
    #include<algorithm>
    using namespace std;
    struct node{
    	string id,name;
    	int grade;
    };
    int cmp1(node a,node b)
    {
    	return a.id<b.id;
    }
    int cmp2(node a,node b)
    {
    	if(a.name==b.name)
    	return a.id<b.id;
    	else
    	return a.name<b.name;
    }
    int cmp3(node a,node b)
    {
    	if(a.grade==b.grade)
    	return a.id<b.id;
    	else
    	return a.grade<b.grade;
    }
    int main()
    {
    	int n,c,i,j;
    	node t;
    	vector<node> s;
    	cin>>n>>c;
    	for(i=0;i<n;i++)
    	{
    		cin>>t.id>>t.name>>t.grade;
    		s.push_back(t);
    	}
    	switch(c)
    	{
    		case 1:sort(s.begin(),s.end(),cmp1);break;
    		case 2:sort(s.begin(),s.end(),cmp2);break;
    		case 3:sort(s.begin(),s.end(),cmp3);break;
    		default: break;
    	}
    	for(i=0;i<s.size();i++)
    	cout<<s[i].id<<" "<<s[i].name<<" "<<s[i].grade<<endl;
    	return 0;
    }